Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku

Abstract

We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detection of an RRC reveals for the first time that G189.6+3.3 possesses an X-ray-emitting recombining plasma (RP). The extracted X-ray spectrum in the 0.6-10.0 keV energy band is well fitted with a model consisting of a collisional ionization equilibrium plasma component (associated with the interstellar medium) and an RP component (associated with the ejecta). The spectral feature shows that G189.6+3.3 is most likely to be a middle-aged SNR with an RP.

Accepted for publication in PASJ

References in corpus (5)

• Diffuse X-Ray Sky in the Galactic Center
• Two Distinct-Absorption X-Ray Components from Type IIn Supernovae: Evidence for Asphericity in the Circumstellar Medium
• Toward the Understanding of the Physical Origin of Recombining Plasma in the Supernova Remnant IC 443
• New Scenario of plasma evolution in IC 443
• X-ray spectra of Sgr A East and diffuse X-ray background near the Galactic center

Cited by in corpus (1)

• ALMA CO Observations of the Mixed-Morphology Supernova Remnant W49B: Efficient Production of Recombining Plasma and Hadronic Gamma-rays via Shock-Cloud Interactions